Solid-State Transformer for Energy Efficiency Enhancement DOI: http://dx.doi.org/10.5772/intechopen.84345


#### Table 5.

A typical configuration of a SST consists of [25]:

composed of an inductor for each phase.

Research Trends and Challenges in Smart Grids

distortion to the output of the SST.

phase voltage.

model of each stage of the SST.

Figure 3. Topology of the SST.

126

1. Input filter, responsible for limiting the ripple of the input current, is

3. High-voltage DC (HVDC) link capacitors are energy storage for control purposes.

4.Dual active bridge (DAB) reduces the voltage level of each of the high links.

5. Low-voltage DC (LVDC) link capacitor is the link between the DAB and the three-phase inverter, which allows the integration of DC sources and DC loads.

6.Three-phase inverter converts the low link voltage into an alternating three-

7. LC filter is responsible for delivering an alternating sinusoidal voltage without

To understand in a better way the SST topology, Figure 3 is presented. Focusing on the control system, it is divided into three stages: (1) multilevel cascade H bridge converter (MCHBC), which facilitates the conversion from AC to DC; (2) dual-active-bridge (DABC) DC-DC converter that allows the regulation of the energy in the low-voltage link capacitor and indirectly the DC voltage; (3) a three-phase inverter in series with a low-pass filter (inverter low-pass filter, ILP), which takes DC input wave and transforms it into AC without any distortion in the waveform. Table 5 shows the description of the electrical circuit and mathematical

2. Full-bridge multilevel rectifier converts AC to DC voltage.

Description of each mathematical model SST stage.
